That is the classic example that I expected someone to point out. Newspapers (and magazines) differ from other consumables in that after having consumed ONE, the consumer has no utility for additional units. So the motivation to take more than one is negligible for the vast majority of consumers. A beverage dispenser -- or any kind of food dispenser -- provides something that the consumer KNOWS he will want more of later. So the temptation to take more than the one that was paid for is considerable.
I also have this complaint for the Eat-'O-Matic. Some vendors pre-2077 were far too trusting.